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ASoC: davinci-mcasp: Extract DMA channels directly from DT

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Extract DMA channels directly from DT as they can not be found from
platform resources anymore. This is a work-around until davinci audio
driver is updated to use dmaengine.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Jyri Sarha 2013-10-18 18:37:43 +03:00 committed by Mark Brown
parent 256ba181cb
commit 4023fe6ff2
3 changed files with 38 additions and 14 deletions
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5
Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
View file

@ -18,6 +18,11 @@ Required properties:
- serial-dir : A list of serializer pin mode. The list number should be equal
to "num-serializer" parameter. Each entry is a number indication
serializer pin direction. (0 - INACTIVE, 1 - TX, 2 - RX)
- dmas: two element list of DMA controller phandles and DMA request line
ordered pairs.
- dma-names: identifier string for each DMA request line in the dmas property.
These strings correspond 1:1 with the ordered pairs in dmas. The dma
identifiers must be "rx" and "tx".
Optional properties:

2
include/linux/platform_data/davinci_asp.h
View file

@ -84,6 +84,8 @@ struct snd_platform_data {
u8 version;
u8 txnumevt;
u8 rxnumevt;
int tx_dma_channel;
int rx_dma_channel;
};
enum {

45
sound/soc/davinci/davinci-mcasp.c
View file

@ -1047,6 +1047,7 @@ static struct snd_platform_data *davinci_mcasp_set_pdata_from_of(
struct snd_platform_data *pdata = NULL;
const struct of_device_id *match =
of_match_device(mcasp_dt_ids, &pdev->dev);
struct of_phandle_args dma_spec;
const u32 *of_serial_dir32;
u8 *of_serial_dir;
@ -1109,6 +1110,28 @@ static struct snd_platform_data *davinci_mcasp_set_pdata_from_of(
pdata->serial_dir = of_serial_dir;
}
ret = of_property_match_string(np, "dma-names", "tx");
if (ret < 0)
goto nodata;
ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
&dma_spec);
if (ret < 0)
goto nodata;
pdata->tx_dma_channel = dma_spec.args[0];
ret = of_property_match_string(np, "dma-names", "rx");
if (ret < 0)
goto nodata;
ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
&dma_spec);
if (ret < 0)
goto nodata;
pdata->rx_dma_channel = dma_spec.args[0];
ret = of_property_read_u32(np, "tx-num-evt", &val);
if (ret >= 0)
pdata->txnumevt = val;
@ -1213,15 +1236,11 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
dma_data->sram_size = pdata->sram_size_playback;
dma_data->dma_addr = dat->start + pdata->tx_dma_offset;
/* first TX, then RX */
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!res) {
dev_err(&pdev->dev, "no DMA resource\n");
ret = -ENODEV;
goto err_release_clk;
}
dma_data->channel = res->start;
if (res)
dma_data->channel = res->start;
else
dma_data->channel = pdata->tx_dma_channel;
dma_data = &dev->dma_params[SNDRV_PCM_STREAM_CAPTURE];
dma_data->asp_chan_q = pdata->asp_chan_q;
@ -1231,13 +1250,11 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
dma_data->dma_addr = dat->start + pdata->rx_dma_offset;
res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (!res) {
dev_err(&pdev->dev, "no DMA resource\n");
ret = -ENODEV;
goto err_release_clk;
}
if (res)
dma_data->channel = res->start;
else
dma_data->channel = pdata->rx_dma_channel;
dma_data->channel = res->start;
dev_set_drvdata(&pdev->dev, dev);
ret = snd_soc_register_component(&pdev->dev, &davinci_mcasp_component,
&davinci_mcasp_dai[pdata->op_mode], 1);